hello every one i have situation were i need to change out a breaker from one gear to another but the voltage on the breaker i need is 120/208v and the other voltage 480/277v its a square D can i do that without any problems.
Are you using a 208V breaker in a 480V service, or other way around?
Can't use a 208V breaker in 480V of course, and the frame size may well be different using a 480V in a 208V service - depends what you have going on.